WO2006098004A1 - Antenna and rfid tag - Google Patents

Antenna and rfid tag Download PDF

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Publication number
WO2006098004A1
WO2006098004A1 PCT/JP2005/004549 JP2005004549W WO2006098004A1 WO 2006098004 A1 WO2006098004 A1 WO 2006098004A1 JP 2005004549 W JP2005004549 W JP 2005004549W WO 2006098004 A1 WO2006098004 A1 WO 2006098004A1
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WO
Grant status
Application
Patent type
Prior art keywords
antenna
element
line
characterized
ru
Prior art date
Application number
PCT/JP2005/004549
Other languages
French (fr)
Japanese (ja)
Inventor
Andrey Andrenko
Toru Maniwa
Original Assignee
Fujitsu Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04Resonant antennas
    • H01Q9/16Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/26Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/12Supports; Mounting means
    • H01Q1/22Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2208Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/36Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/0006Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
    • H01Q15/0093Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices having a fractal shape
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04Resonant antennas
    • H01Q9/16Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/28Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04Resonant antennas
    • H01Q9/16Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/28Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines
    • H01Q9/285Planar dipole
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69Spread spectrum techniques
    • H04B1/713Spread spectrum techniques using frequency hopping
    • H04B1/715Interference-related aspects
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69Spread spectrum techniques
    • H04B1/713Spread spectrum techniques using frequency hopping
    • H04B1/715Interference-related aspects
    • H04B2001/7154Interference-related aspects with means for preventing interference

Abstract

An antenna line (11) is composed of a conductor line which meanders in a manner where a plurality of lines, which are bent only obtusely and have identical shapes, are connected.

Description

Specification

Antenna, and RFID tags

Technical field

[0001] The present invention relates to antenna technology, in particular, for the miniaturization technique of the antenna.

BACKGROUND

[0002] RFID (Radio Frequency Identification) technique is a technique for recognizing the Detakiya rear in a non-contact manner using radio waves. This technique, leave imparting tag (RFID tag) an IC chip and an antenna are embedded in objects and people, the device and the RFI D tag called RFID reader-writer communicates using radio waves, the the information which is on the IC chip (RFID tag IC) by reading the RFID reader-writer is that performs recognition of itself and people.

[0003] FIG. 7 shows a first example of possible antenna to the RFID tag. This antenna is a fundamental dipole antenna of the full-length 1Z2 wavelengths are formed in the antenna line 101, the RFID tag by connecting this antenna to an RFID tag IC10 is formed.

[0004] Further, FIG. 8 shows a second example of possible antenna to the RFID tag. This antenna is a fundamental loop antenna all around one wavelength that is formed in the antenna line 102, the RFID tag by connecting this antenna to an RFID tag IC10 is formed.

[0005] Since the basic antenna of RFID tag when the or or use of such a dipole antenna or a loop antenna becomes very large, the RFID tag is demanded miniaturization of antenna , Ru.

[0006] technology to the antenna for miniaturization have been proposed from the conventional! Ru.

For example, Figure 9 shows a third example of possible antenna to the RFID tag. The § antenna is obtained by miniaturized by bending at a right angle to the first pair of § antenna line 101 that forms a dipole antenna according to the example shown in FIG. 7 to meander.

[0007] Further, FIG. 10 shows a fourth example of possible antenna to the RFID tag. This antenna is obtained by miniaturized by bending the loop-shaped antenna line 102 along the Hilbert fractal pattern constituting the loop antenna shown in FIG. [0008] In addition, FIG. 11 shows a fifth example of usable antennas to the RFID tag. The § antenna is obtained by downsizing the loop-shaped antenna line 102 that constitutes the loop antenna bent along the co Tsu ho fractal pattern shown in FIG. Note that the fractal, e.g., FIG. 12A is a partial view of the pattern of Figure 11, and as shown in FIG. 12B showing an outline of the pattern, those portions of the graphic is in its entirety and self-similar Say. That is, in FIG. 12B, relationship replaced from the pattern 102a of the patterns 102b, even as the relationship between replacement of the pattern 102b force even pattern 102c, replace the linear portion force large shape and form of the entire similar shape since being, it is possible to obtain a longer path length by a fractal pattern shape of the antenna line 1 02.

[0009] Thus, techniques using conductor lines were serpentine as an antenna element is our line conventionally.

For example, Patent Document 1, the two coils together is erected on the ground conductor, a technique of forming a loop antenna is disclosed by connecting the two coils in meandering linear conductor or plate-shaped conductor ヽthat.

[0010] Further, for example, Patent Document 2, further techniques antenna element of zigzag pair configuration constituting the dipole antenna is arranged to be bent along the inner wall surface of the housing is disclosed, for example, JP 3, for example, as shown in FIG. 13, snowflake (snowflake) the form to the loop antenna bent linear conductor is disclosed 1, Ru.

[0011] antenna provided in the RFID tag is a hand that is required to be small as described above, it is desirable to suppress the decrease of the antenna gain to obtain a long communication distance. Further, without providing a battery in the RFID tag itself, using a radio wave from the RFID reader-writer as a power source for the operation of the RFID tag, the RFID tag is a so-called passive tag, in order to obtain a high power supply voltage, high ヽthe impedance of the antenna is required.

[0012] However, if simply to meander conductor lines is an antenna element to reduce the size of the antenna, contrary to the above request, thereby causing a reduction in the degradation or impedance gain. Patent Document 1: JP 2001- 284935 discloses (paragraph [0021] - [0027], FIG. 1)

Patent Document 2: JP 2000- 349526 discloses (paragraph [0043] - [0051], FIG. 1) Patent Document 3: U.S. Patent No. 6,603,440 (column 9, line 56 - 59, line 10 column, Figure 10 A, FIG. 10B, 11A, 11B, 11C)

Disclosure of the Invention

[0013] The present invention has been made in view of the above problem, problem to be cane its resolution, by meandering conductor line is an antenna element be miniaturized antenna, so that the lowering of the gain is reduced it is to.

[0014] antenna is one aspect of the present invention, Ru ヽ antenna element is constituted by meandering the same type of lines are bent only at an obtuse angle with multiple articulated so shape! / Ru conductor line it is taken as the said, to solve the problems described above by this feature.

[0015] According to the above-described configuration, since the right-angle or sharp bent portion of the conductor line composing the antenna element is reduced, reduces the loss of energy of the high-frequency signal, the radiation efficiency of the antenna is improved as a result.

[0016] Incidentally, Te contact, the antenna according to the present invention described above, in the antenna elements constitute a Daiporua antenna, even shall,.

Further, in the antenna according to the present invention described above, the antenna element constitutes a loop antenna, a current maximum point at the antenna elements at the time when the power supply of the high-frequency signal, in the antenna element in when the power supply It placed near the feed point of the antenna element than the voltage maximum point of even.

[0017] According to this configuration, as a result of binding of the line around the line and the current maximum point point near the feeding point becomes strong, it is possible to increase the impedance of the antenna.

At this time, the entire periphery of the length of the antenna elements forming the loop antenna may be substantially 1 wavelength.

[0018] At this time, the configured antenna elements, said current line width at the maximum point of Ru conductor lines, thick than the line width at the feeding point in the conductor lines!, There is I also! /,. According to this configuration, electrical current flow into the power supply apparatus of a current maximum point near neighbor installed to a feeding point

The results hardly flows than the body line, the impedance becomes large.

[0019] Further, in the antenna according to the present invention described above, the inductive element to offset the capacitive component feed device for feeding a high-frequency signal are provided to the feeding point of the antenna element to the antenna element, the inductive element , is formed by the same type of lines are bent only at an obtuse angle with multiple articulated so shape conductor lines!, also.

[0020] According to this arrangement, the energy loss in the inductive element decreases.

Incidentally, provided with an antenna according to the present invention described above, RFID tags, wherein Rukoto also those according to the present invention.

[0021] The present invention, by the structure described above, even if by meander conductor lines is an antenna element miniaturize the antenna, the less the decrease in gain brings the cormorants effect.

BRIEF DESCRIPTION OF THE DRAWINGS

[0022] is a diagram illustrating a configuration example of an antenna implementing the FIG. 1 the invention.

It is a diagram showing a first example of a bending shape of the base line constituting the Figure 2A] antenna.

Is a diagram showing a second example of a bending shape of FIG. 2B] basic line constituting the antenna.

It is a diagram showing a third example of a bent shape of the base line constituting the Figure 2C] antenna.

It is a diagram showing a fourth example of the bent shape of FIG. 2D] basic line constituting the antenna.

3 is a diagram showing an example of a loop antenna configured close the current maximum point.

Is a diagram illustrating a FIG. 4 simulation results for current distribution of the loop antenna shown in FIG.

5 is a diagram showing an example of a feeding point opposite the loop antenna with thicker line width of the current maximum point near the.

[6] Te Contact! /, The dipole antenna shown in FIG. 1, is arranged to the feeding point!, Ru RFID tag

Is a diagram showing an example of inserting the inductive element in parallel to the IC.

7 is a diagram showing a first example of possible antenna to the RFID tag.

8 is a diagram showing a second example of possible antenna to the RFID tag.

9 is a diagram showing a third example of possible antenna to the RFID tag.

10 is a diagram showing a fourth example of possible antenna to the RFID tag.

11 is a diagram showing a fifth example of usable antennas to the RFID tag.

Is a partial view of the antenna shown in FIG. 12A] FIG.

Is a diagram illustrating the fractal pattern in FIG 12B] FIG.

[Figure 13] linear conductor is a diagram showing an example of a conventional loop antenna formed by bending the snowflake.

BEST MODE FOR CARRYING OUT THE INVENTION

[0023] Hereinafter, an embodiment of the present invention with reference to the accompanying drawings.

Figure 1 shows a configuration example of an antenna implementing the present invention. This antenna is Daiporua container of overall length 1Z2 wavelengths are formed of a pair of antenna lines 11 is a conductor line, the RFID tag by connecting this antenna to an RFID tag IC10 is formed. However, the shape of the antenna elements forming the antenna (pair of antenna line 11), the linear portion of the antenna line 101 of Figure 9 that was bent at a right angle to the meander shape, replacing the bent line at an obtuse angle was serves as, a result, a right angle (90 °) Moshiku is bent portion is reduced is an acute angle, Ru.

[0024] Generally, when bent at an acute angle or a conductor line composing the antenna element at right angles, it is the energy that should the high-frequency signal is an antenna power radiation is lost at that portion by interference or the like, the radiation efficiency of the antenna as a whole There deteriorated. Here, the antenna line path 11, FIG.

Replacing the conductor lines such bent at an obtuse angle as shown in 1, since the antenna elements reduces the perpendicular or acute bent portion of the conductor line configuration reduces the loss of E Nerugi one high frequency signal, the antenna as a result than is the radiation efficiency is improved.

[0025] In the example of FIG. 1, but so as to meander the same type of lines are bent only at an obtuse angle with multiple articulated so shape! / In Ru conductor lines composing the dipole antenna, Alternatively, as shown in FIGS. 10 and 11, it is a loop antenna by replacing the linear portion of the antenna line 102 that has been bent along the fractal pattern line bent at an obtuse angle good. In addition, it is a fractal pattern of the replaced antenna line 102 no longer! /,.

[0026] Further, in the above example, the same type of line, such as shown in Figure 2A, i.e., for example, 1 to 20 ° of the line is bent only at an obtuse angle adopted, plural connecting the same type of lines and this meanders in a shape obtained by, Ru conductor line to form an antenna element in was, but instead of employing a line of the form, the shape of the curve bent into a semi-circular as illustrated in Figure 2B Yogu also be employed to or may be adopted the shape of the curve bent into a sinusoidal wave of one cycle, as illustrated in Figure 2C. Further, as illustrated in FIG. 2D, as a shape of a combination of a sine waveform of the semicircular and Figure 2C in Figure 2B, it is adopted a line shape that combines different shapes Yo, .

[0027] Incidentally, as described above, the RFID tag is Nosshibutagu, high, in order to obtain a power supply voltage, is required high impedance of the antenna. In this regard, one-wavelength loop antenna as shown in FIG. 8, the impedance is high (typically about 300 Omega), preferably as a RFI D tag. However, the conventional loop antenna is formed by bending as illustrated in FIG. 13, the linear conductor has a feeding point 12a of the RFID tag are connected in the antenna line 12, the position of 1Z2 wavelength from the feed point 12a We've 12b is distant points is. In the one-wavelength loop antenna, the high frequency current Both the feeding point 1 2a and point 12b in the antenna line 12 is that far away is to become force of the two points up, and reduced to about several tens Ω impedance put away.

[0028] Therefore, as shown in FIG. 3, meanders of the same type of lines are bent only at an obtuse angle with multiple articulated so shape! /, Us the antenna line 12 is a conductor line Ru, Te, feed entire periphery of the length and disposed close to between the point 12a and the point 12b constitute a loop antenna of approximately one wavelength, using the antenna in the RFID tag. Thereby, the binding of the line around the line and the point 12b in the vicinity of the feeding point 12a becomes stronger result, it is possible to increase the impedance.

[0029] The results of computer simulation of the current distribution of the high frequency current in FIG. 4 at the time when the power supply of the high-frequency signal to the illustrated loop antenna in FIG. In the figure shows that the darker color a large current flows. The Bunryokuru so also from the figure, in this loop antenna, 12b that high-frequency current becomes a maximum at the antenna line 12 is, that the high-frequency current is minimum (i.e., that the high-frequency current is maximum) than 12c, it is located near the feeding point 12a, seen Rukoto.

[0030] Incidentally, in the illustrated loop antenna 3, the line width of the point 12b near neighbor in the antenna line 12, as shown in FIG. 5, when thicker than the feeding point 12a near is installed in the feeding point 12a results current flow into the RFID tag IC hardly flows than the antenna line 12 in the vicinity of the point 12b, the impedance increases.

[0031] Incidentally, there is a case of connecting in parallel the inductive element to offset internal volume of the RFID tag IC to the antenna. 6, in the illustrated dipole antenna 1, distribution to the feeding point

Is location! Parallel with the Ru RFID tag IC 10, is a diagram showing an example of inserting such inductive element 13. In this example, the inductive element 13, similar to the antenna element 11, are formed in the conductor line of a shape only folded by! Ru same type of lines at an obtuse angle to multiple concatenated! Ru. Accordance connexion, the inductive element 13 also has as an energy loss is small.

In addition, the present invention is, Do emerged Yat the gist of the present invention Nag being limited to the embodiments described above, but various improvements and modifications within the scope.

For example, although the loop antenna is constructed in the shape of a line symmetry as shown in FIGS. 3 and 5, be in the form of asymmetrical.

Claims

The scope of the claims
[1] bent only at an obtuse angle, Ru meanders of the same type of lines in the shape that has a plurality of articulated, a conductor line antenna element is Ru, characterized in that it is constructed antenna.
[2] The antenna element antenna of claim 1, wherein the Ru constitute a dipole antenna.
[3] The antenna elements constitute a loop antenna, the than voltage maximum point in the antenna element at the time when definitive and current maximum point force the feeding in the antenna element when feeding a high-frequency signal antenna the antenna according to claim 1, characterized in that you have placed near the feed point of the element.
[4] The antenna according to claim 3 in which the entire periphery of the length of the antenna elements forming the loop antenna is characterized in that it is a substantially 1 wavelength.
[5] The antenna according to claim 3, characterized in that the diameter is larger than the line width at the feeding point in the line width force the conductor line at the current maximum point of the conductor line constituting the antenna element.
[6] inductive element to offset the capacitive component feed device for feeding a high-frequency signal to the antenna element is provided with a feed point of the antenna element,
The inductive element is formed by the same type of lines are bent only at an obtuse angle with multiple articulated so the shape of the conductor lines Ru,
The antenna according to claim 1, characterized in that.
[7] RFID tag, characterized in that is provided with an antenna according to any one of claims 1 to 6.
PCT/JP2005/004549 2005-03-15 2005-03-15 Antenna and rfid tag WO2006098004A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2005/004549 WO2006098004A1 (en) 2005-03-15 2005-03-15 Antenna and rfid tag

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
EP20050720805 EP1860728A4 (en) 2005-03-15 2005-03-15 Antenna and rfid tag
CN 200580048719 CN101128956B (en) 2005-03-15 2005-03-15 Antenna and RFID label
JP2007507974A JPWO2006098004A1 (en) 2005-03-15 2005-03-15 Antenna, and rfid tag
PCT/JP2005/004549 WO2006098004A1 (en) 2005-03-15 2005-03-15 Antenna and rfid tag
US11898425 US7773045B2 (en) 2005-03-15 2007-09-12 Antenna and RFID tag

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US11898425 Continuation US7773045B2 (en) 2005-03-15 2007-09-12 Antenna and RFID tag

Publications (1)

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WO2006098004A1 true true WO2006098004A1 (en) 2006-09-21

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PCT/JP2005/004549 WO2006098004A1 (en) 2005-03-15 2005-03-15 Antenna and rfid tag

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US (1) US7773045B2 (en)
EP (1) EP1860728A4 (en)
JP (1) JPWO2006098004A1 (en)
CN (1) CN101128956B (en)
WO (1) WO2006098004A1 (en)

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Also Published As

Publication number Publication date Type
US20080012773A1 (en) 2008-01-17 application
JPWO2006098004A1 (en) 2008-08-21 application
EP1860728A4 (en) 2008-12-24 application
US7773045B2 (en) 2010-08-10 grant
CN101128956A (en) 2008-02-20 application
CN101128956B (en) 2012-11-21 grant
EP1860728A1 (en) 2007-11-28 application

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